Abstract: The new technology of well-flushing with parker can greatly increase the quality and efficiency of washing a well. Since the traditional washing ways are time-consuming, the results are not ideal, and the wells cannot be washed thoroughly, especially in aquifers of large thickness, the CHEGS explores a new well-flushing technology. This paper depicts the flushing principle and process, and flushing and layered pumping test of the HQ8 exploration hole are taken as a case study. The result show that the new technology can also wash a well completely in aquifers of large thickness. Through the layered pumping test the hydrogeological parameters of the actual values can be obtained. The technology may improve the precision of hydrogeological exploration, and is especially suitable for aquifers of large thickness.